<!DOCTYPE HTML>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>hello world</title>
    <script type="text/javascript" src="<?=APP_URL?>js/app.js"></script>
    <script type="text/javascript" src="<?=BACKYARD_URL?>js/backyard.js"></script>
    <link rel="stylesheet" type="text/css" media="all" href="<?=APP_URL?>css/app.css" >
</head>
<body>
    123
</body>